Re: motion notify question

[Havoc Pennington <hp redhat com>]

Hmm, I just noticed that GTK 1.2 specifies OwnerGrabButtonMask in the
event mask for the X window, and GTK 1.3.x does not.

Fri Feb 18 14:37:29 2000  Owen Taylor  <otaylor redhat com>

        * gdk/x11/gdkwindow-x11.c (gdk_event_mask_table): Remove
        OwnerGrabButtonMask from button entries for
        GDK_BUTTON_PRESS / GDK_BUTTON_RELEASE.

Owen didn't explain the issues there, he can probably do so better
than I can.

pavel klebanov ne mediaone net writes:
> You make a good point, but my experiments show that if you were to release
> in another window which captures releases then the release won't register
> in the original widget. Is this your experience, too?
>
> So if you are programming something like a lever, the following
> unfortunate combination might happen. Suppose you
> 1. Press the mouse within the lever.
> 2. Move it outside the bounds.
> 3. Release it over another lever.
> 4. Then press it down elsewhere
> 5. Move it with in the bounds of the original lever.
>
> As far as the original lever is concerned then is that it's been pressed
> down and now the mouse is moving over it with the button pressed. So it
> must react which is incorrect. The problem is that it has no way to find
> out that it's been released and that another one has been pressed - if
> there's no communication between the objects.
>
> The way I solve the problem is by enabling focus and then capturing the
> loss of focus, but you would agree that's not very clean...

I think it may change depending on GTK version, then.

Havoc